Secondo https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man5/resolver.5.html
dovresti essere in grado di impostare una porta diversa per dns, ovvero:
example, 10.0.0.17.55 specifies that the nameserver at 10.0.0.17 uses port 55.
ma:
sh-3.2# networksetup -setdnsservers Ethernet 185.37.37.37.54
185.37.37.37.54 is not a valid IP address. No changes were saved...
** Error: The parameters were not valid.
cosa dà? come posso risolvere questo?